package com.aWei.springbootinit.service.impl;

import static com.aWei.springbootinit.constant.UserConstant.USER_LOGIN_STATE;

import cn.hutool.core.collection.CollUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.aWei.springbootinit.common.ErrorCode;
import com.aWei.springbootinit.constant.CommonConstant;
import com.aWei.springbootinit.exception.BusinessException;
import com.aWei.springbootinit.mapper.UserMapper;
import com.aWei.springbootinit.model.dto.user.UserQueryRequest;
import com.aWei.springbootinit.model.entity.User;
import com.aWei.springbootinit.model.enums.UserRoleEnum;
import com.aWei.springbootinit.model.vo.LoginUserVO;
import com.aWei.springbootinit.model.vo.UserVO;
import com.aWei.springbootinit.service.UserService;
import com.aWei.springbootinit.utils.SqlUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import javax.servlet.http.HttpServletRequest;

import lombok.extern.slf4j.Slf4j;
import me.chanjar.weixin.common.bean.WxOAuth2UserInfo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

/**
 * 用户服务实现
 *
 阿维
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

        /**
         * 盐值，混淆密码
         */
        public static final String SALT = "yupi";

        @Override
        public long userRegister(String userAccount, String userPassword, String checkPassword) {
                // 1. 校验
                if (StringUtils.isAnyBlank(userAccount, userPassword, checkPassword)) {
                        throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
                }
                if (userAccount.length() < 4) {
                        throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
                }
                if (userPassword.length() < 8 || checkPassword.length() < 8) {
                        throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
                }
                // 密码和校验密码相同
                if (!userPassword.equals(checkPassword)) {
                        throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
                }
                synchronized (userAccount.intern()) {
                        // 账户不能重复
                        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
                        queryWrapper.eq("userAccount", userAccount);
                        long count = this.baseMapper.selectCount(queryWrapper);
                        if (count > 0) {
                                throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
                        }
                        // 2. 加密
                        String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
                        // 3. 插入数据
                        User user = new User();
                        user.setUserAccount(userAccount);
                        user.setUserPassword(encryptPassword);
                        boolean saveResult = this.save(user);
                        if (!saveResult) {
                                throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
                        }
                        return user.getId();
                }
        }

        @Override
        public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
                // 1. 校验
                if (StringUtils.isAnyBlank(userAccount, userPassword)) {
                        throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
                }
                if (userAccount.length() < 4) {
                        throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号错误");
                }
                if (userPassword.length() < 8) {
                        throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
                }
                // 2. 加密
                String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
                // 查询用户是否存在
                QueryWrapper<User> queryWrapper = new QueryWrapper<>();
                queryWrapper.eq("userAccount", userAccount);
                queryWrapper.eq("userPassword", encryptPassword);
                User user = this.baseMapper.selectOne(queryWrapper);
                // 用户不存在
                if (user == null) {
                        log.info("user login failed, userAccount cannot match userPassword");
                        throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
                }
                // 3. 记录用户的登录态
                request.getSession().setAttribute(USER_LOGIN_STATE, user);
                return this.getLoginUserVO(user);
        }

        @Override
        public LoginUserVO userLoginByMpOpen(WxOAuth2UserInfo wxOAuth2UserInfo, HttpServletRequest request) {
                String unionId = wxOAuth2UserInfo.getUnionId();
                String mpOpenId = wxOAuth2UserInfo.getOpenid();
                // 单机锁
                synchronized (unionId.intern()) {
                        // 查询用户是否已存在
                        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
                        queryWrapper.eq("unionId", unionId);
                        User user = this.getOne(queryWrapper);
                        // 被封号，禁止登录
                        if (user != null && UserRoleEnum.BAN.getValue().equals(user.getUserRole())) {
                                throw new BusinessException(ErrorCode.FORBIDDEN_ERROR, "该用户已被封，禁止登录");
                        }
                        // 用户不存在则创建
                        if (user == null) {
                                user = new User();
                                user.setUnionId(unionId);
                                user.setMpOpenId(mpOpenId);
                                user.setUserAvatar(wxOAuth2UserInfo.getHeadImgUrl());
                                user.setUserName(wxOAuth2UserInfo.getNickname());
                                boolean result = this.save(user);
                                if (!result) {
                                        throw new BusinessException(ErrorCode.SYSTEM_ERROR, "登录失败");
                                }
                        }
                        // 记录用户的登录态
                        request.getSession().setAttribute(USER_LOGIN_STATE, user);
                        return getLoginUserVO(user);
                }
        }

        /**
         * 获取当前登录用户
         *
         * @param request
         * @return
         */
        @Override
        public User getLoginUser(HttpServletRequest request) {
                // 先判断是否已登录
                Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
                User currentUser = (User) userObj;
                if (currentUser == null || currentUser.getId() == null) {
                        throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
                }
                // 从数据库查询（追求性能的话可以注释，直接走缓存）
                long userId = currentUser.getId();
                currentUser = this.getById(userId);
                if (currentUser == null) {
                        throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
                }
                return currentUser;
        }

        /**
         * 获取当前登录用户（允许未登录）
         *
         * @param request
         * @return
         */
        @Override
        public User getLoginUserPermitNull(HttpServletRequest request) {
                // 先判断是否已登录
                Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
                User currentUser = (User) userObj;
                if (currentUser == null || currentUser.getId() == null) {
                        return null;
                }
                // 从数据库查询（追求性能的话可以注释，直接走缓存）
                long userId = currentUser.getId();
                return this.getById(userId);
        }

        /**
         * 是否为管理员
         *
         * @param request
         * @return
         */
        @Override
        public boolean isAdmin(HttpServletRequest request) {
                // 仅管理员可查询
                Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
                User user = (User) userObj;
                return isAdmin(user);
        }

        @Override
        public boolean isAdmin(User user) {
                return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
        }

        /**
         * 用户注销
         *
         * @param request
         */
        @Override
        public boolean userLogout(HttpServletRequest request) {
                if (request.getSession().getAttribute(USER_LOGIN_STATE) == null) {
                        throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
                }
                // 移除登录态
                request.getSession().removeAttribute(USER_LOGIN_STATE);
                return true;
        }

        @Override
        public LoginUserVO getLoginUserVO(User user) {
                if (user == null) {
                        return null;
                }
                LoginUserVO loginUserVO = new LoginUserVO();
                BeanUtils.copyProperties(user, loginUserVO);
                return loginUserVO;
        }

        @Override
        public UserVO getUserVO(User user) {
                if (user == null) {
                        return null;
                }
                UserVO userVO = new UserVO();
                BeanUtils.copyProperties(user, userVO);
                return userVO;
        }

        @Override
        public List<UserVO> getUserVO(List<User> userList) {
                if (CollUtil.isEmpty(userList)) {
                        return new ArrayList<>();
                }
                //集合转换流：将集合中的每个元素通过getUserVO方法进行转换后放到新的list集合中，并返回
                return userList.stream().map(this::getUserVO).collect(Collectors.toList());
        }

        @Override
        public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
                QueryWrapper<User> queryWrapper = new QueryWrapper<>();
                if (userQueryRequest == null) {
                        throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
                }
                Long id = userQueryRequest.getId();
                String unionId = userQueryRequest.getUnionId();
                String mpOpenId = userQueryRequest.getMpOpenId();
                String userName = userQueryRequest.getUserName();
                String userProfile = userQueryRequest.getUserProfile();
                String userRole = userQueryRequest.getUserRole();
                String sortField = userQueryRequest.getSortField();
                String sortOrder = userQueryRequest.getSortOrder();
                queryWrapper.eq(id != null, "id", id);
                queryWrapper.eq(StringUtils.isNotBlank(unionId), "unionId", unionId);
                queryWrapper.eq(StringUtils.isNotBlank(mpOpenId), "mpOpenId", mpOpenId);
                queryWrapper.eq(StringUtils.isNotBlank(userRole), "userRole", userRole);
                queryWrapper.like(StringUtils.isNotBlank(userProfile), "userProfile", userProfile);
                queryWrapper.like(StringUtils.isNotBlank(userName), "userName", userName);
                queryWrapper.orderBy(SqlUtils.validSortField(sortField), sortOrder.equals(CommonConstant.SORT_ORDER_ASC),
                        sortField);
                return queryWrapper;
        }

         public QueryWrapper<User> getUserAll() {
                 QueryWrapper<User> queryWrapper = new QueryWrapper<>();
                 return queryWrapper.eq("isDelete", 0);
         }

        @Override
        public Page<UserVO> listUserVOByPage(UserQueryRequest userQueryRequest) {
                long current = userQueryRequest.getCurrent();
                long pageSize = userQueryRequest.getPageSize();
                //根据查询获取数据并进行分野封装
                Page<User> userPage = this.page(new Page<>(current, pageSize),
                        this.getQueryWrapper(userQueryRequest));
                //直接查询所有
                if(userPage.getRecords().isEmpty()){
                        userPage=this.page(new Page<>(current, pageSize),
                                this.getUserAll());
                }
                Page<UserVO> userVOPage = new Page<>(current, pageSize, userPage.getTotal());
                List<UserVO> userVO = this.getUserVO(userPage.getRecords());
                userVOPage.setRecords(userVO);
                return userVOPage;
        }

}
